Riskcovery

CVE-2024-44963

btrfs: do not BUG_ON() when freeing tree block after error

State
Published
Severity
Not scored
Published
Sep 4, 2024
Updated
Oct 30, 2026
Reserved
Aug 21, 2024

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

btrfs: do not BUG_ON() when freeing tree block after error

When freeing a tree block, at btrfs_free_tree_block(), if we fail to create a delayed reference we don't deal with the error and just do a BUG_ON(). The error most likely to happen is -ENOMEM, and we have a comment mentioning that only -ENOMEM can happen, but that is not true, because in case qgroups are enabled any error returned from btrfs_qgroup_trace_extent_post() (can be -EUCLEAN or anything returned from btrfs_search_slot() for example) can be propagated back to btrfs_free_tree_block().

So stop doing a BUG_ON() and return the error to the callers and make them abort the transaction to prevent leaking space. Syzbot was triggering this, likely due to memory allocation failure injection.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 to before bfcef12f80b3a9bd6b09c7305679164e3307328aAffected
  • fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 to before 22d907bcd283d69d5e60497fc0d51969545c583bAffected
  • fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 to before 98251cd60b4d702a8a81de442ab621e83a3fb24fAffected
  • fb235dc06fac9eaa4408ade9c8b20d45d63c89b7 to before bb3868033a4cccff7be57e9145f2117cbdc91c11Affected
LinuxLinux
  • 4.11Affected
  • before 4.11Not affected
  • 6.1.191 through 6.1.*Not affected
  • 6.6.64 through 6.6.*Not affected
  • 6.10.5 through 6.10.*Not affected
  • 6.11 and laterNot affected

References

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